Officials at Frankfurt’s airport said they already confiscated 35 tons of the hand-held spinning tops in May. According to employees of the Central Customs Office in Frankfurt, some of the LED lights in the spinners could become so easily unhinged that small children could swallow them.

The toy is currently very popular with children. Manufacturers claim they help children to alleviate symptoms of ADHD, autism or hyperactivity, The Local.de reported.

Customs officials said the fidget spinners arrived in several import shipments from China.